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Notice: Undefined index: userfile in /htdocs/www/test/upload.php on line 5
Notice: Undefined index: userfile in /htdocs/www/test/upload.php on line 6

EDIT::I've kind of narrowed this down by placing some "echo" lines for error handling and have determined the errors begin in the validate_extension() function at the (!$file_name) so something must be wrong with the way I'm uploaded the file.